Please note, that when there is no active network connection (e.g. WiFi or Ethernet), then you have to manually type into the 'Address' field one the following values in order to be able to connect to your ETS Inside server:

localhost

or

127.0.0.1

or

PC name

To find the PC name, just go to the 'Settings' of the Windows of ETS Inside server, tap the 'About' (1) and the name can be found it on top (2).